(C) Underline the correct word in each of the brackets.

　　(16 * 1 = 16 marks)

　　21. I (was， were) naughty when I was younger.

　　22. We (was， were) talking about you yesterday.

　　23. She (was， were) not in school last week.

　　24. The children (was， were) at the canteen at one o‘clock.

　　25. His cats (was， were) sleeping under the table last night.

　　26. He (was， were) fat when he was a baby.

　　27. They (was， were) very quiet when their teacher scolded them.

　　28. You (was， were) shorter than me last year.

　　29. My wallet (was， were) in the cupboard yesterday.

　　30. The night (was， were) beautiful and we sat by the beach singing.